Question

我正在尝试创建一个跟踪用户位置的应用，并根据用户的位置创建一条线。我在用户去过的地方创建了一堆注释，但无法弄清楚如何在它们之间创建一条线。我是swift和Xcode的新手，我已经浏览了整个互联网，但找不到任何有用的东西。 Picture of app with annotations following user location

这是我的代码：

import UIKit
import MapKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {
    @IBOutlet var mapView: MKMapView?

    //Map
    @IBOutlet weak var map: MKMapView!
    @IBOutlet weak var lblSpeed: UILabel!

    let manager = CLLocationManager()

    @IBOutlet weak var lblAltitude: UILabel!

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let location = locations[0]

        let span:MKCoordinateSpan = MKCoordinateSpanMake(0.01, 0.01)

        let myLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)

        let region:MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span)

        lblAltitude.text = String(format:"%.2f", location.altitude)
        lblSpeed.text = String(format:"%.2f", location.speed)

        self.map.showsUserLocation = true

        var testLocation = CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude)

        var annotation = MKPointAnnotation()
        annotation.coordinate = testLocation
        map.addAnnotation(annotation)

        var locationTest = [CLLocation(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)]
        var coordinates = locations.map({(location: CLLocation!) -> CLLocationCoordinate2D in return location.coordinate})
        var polyline = MKPolyline(coordinates: &testLocation, count: locations.count)

        func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
            if overlay is MKPolyline {
                let polylineRenderer = MKPolylineRenderer(overlay: overlay)
                polylineRenderer.strokeColor = UIColor.blue
                polylineRenderer.lineWidth = 5
                return polylineRenderer
            }

            return nil
        }
    }

Answer 1

你可以尝试

rendererForOverlay

//你也可能想要缩小以显示所有注释+看到画线

 func mapView(mapView: MKMapView!, rendererForOverlay overlay: MKOverlay!) -> MKOverlayRenderer! {
        if overlay is MKPolyline {
            let polylineRenderer = MKPolylineRenderer(overlay: overlay)
            polylineRenderer.strokeColor = UIColor.blue
            polylineRenderer.lineWidth = 5
            return polylineRenderer
        }

        return nil
    }

//同样{{1}} func必须在类级别而不是在另一个函数

中

{{1}}

如何在Swift中的位置点之间创建一条直线（折线）？

1 个答案: